
#include"mymath.h"

int add(int x,int y)
{
  return x + y;
}
int sub(int x,int y)
{
  return x - y;
}
int mul(int x,int y)
{
  return x * y;
}
int myerrno = 0;
int div(int x,int y)
{
  if(y == 0)
  {
    myerrno = 1;
    return -1;
  }
   return x / y;
}
